Amo Kusakari stars in the Gerosu series as a cute younger sister-type girl with a devilish personality. Despite her innocent appearance, she torments male masochists using every kind of bodily fluid—vomit, feces, urine, and snot. She chews her own vomit thoroughly in her mouth before performing spit-swapping and repeated vomit exchanges using a hose. When the male performer, unable to endure her relentless abuse, involuntarily vomits back, Amo scolds him in a high-pitched anime voice, "No, no! You have to eat it!" refusing to let him weaken. She continues her merciless assault, forcing him to drink and eat filth, including mouth-to-mouth coprophagia, delivering intense, unforgiving play throughout.